Great 3D game where you find yourself in the American Civil War. Your task will be to control the gun and fire on arriving enemies. They will walk in medium-sized groups, so you have to guess the distance and set up properly the cannon.
A/Arrow left - Aim left.
D/Arrow right - Aim right.
W/Arrow up - Aim upwards.
S/Arrow down - Aim downwards.
Mouse - Aim, left click to fire.